From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2006-08-11T03:05:14+09:00
Subject: Re: good writing in Ruby...

Josselin wrote:
> I know I can write it the 'ugly common way' (loop)
> but I'd like to see how it can be done the Ruby way ... (I am a newbie...)
> 
> here is an array
> roles = [ "a", "b", "c", "d", "e" ]
> 
> Depending upon a variable 'user.role',
> I would like to  suppress all elements in the array , less or equal to 
> this variable
> 
> ex :
> user.role = "a"    #=> roles = ["b", "c", "d", "e" ]            "a" deleted
> user.role = "b"    #=> roles = ["c", "d", "e" ]           "a", "b"  deleted
> user.role = "c"    #=> roles = [ "d", "e" ]               "a", "b", "c" 
> deleted
> user.role = "d"    #=> roles = [ "e" ]                    "a", "b", "c", 
> "d"  deleted
> user.role = "e"    #  do nothing

I'm not quite sure I understand your problem. Is this what you're 
looking for?

   roles = %w{a b c d e}
   user.role = "c"

   # non-destructive:
   roles.select{|role| role > user.role }  #=> ["d", "e"]
   roles  #=> ["a", "b", "c", "d", "e"]

   # destructive:
   roles.delete_if{|role| role <= user.role }
   roles  #=> ["d", "e"]


Cheers,
Daniel